Rotary blower.



T. W. GREEN. ROTARY BLOWER.

APPLICATION FILED MAY 26,1910.

Patented June 6, 1911.

3 SHEETSSHEET 1.

T. W. GREEN.

ROTARY BLOWER.

APPLIOATION FILED MAY 26,,1910.

Patented June 6, 1911.

3 SHEETSr-SHEET 2.

. INVENTOR wnwssss A Q I [I t BY v v ATTORNEY T. W. GREEN.

ROTARY BLOWER.

APPLICATION FILED MA'Y 26,1910.

Patented June 6,1911.

INVENTOR 3 SHEETS-SHEET 3.

ATTORNEY THOMAS W. GREEN, OF PI-IILADELPHIA, PENNSYLVANIA.

ROTARY BLOWER.

ocean.

. Specification of Letters Patent.

Application filed May 26, 1310. Serial No. 563,594.

Patented June 6, 1911?.

' To all whom it may concern:

Be it known that I, THoMAs W. GREEN, a citizen of the United States, anda resident of Philadelphia, Pennsylvania, have invented a certain newand useful Rotary Blower, of which the following is a specification.

The purpose of my invention is to pan tially inclose a rotary blowerimpeller blade by a web, vane or shroud of partial cylindrical contourterminating in or flaring into wings of oppositely curved contour andusing therewith a cresent valve, whose interior or concave face seals byclosely approaching the flared terminals and whose convex surface rollsupon the cylindrical contour of the web during the mutual and preferablyequal rotation of the valve and impeller blade.

A further purpose of my invention is to provide a two cylinder balancedrotary blower having but a single valve mechanism in eac'h'cylinder,providing for the passage of oppositely directed impeller blades at 180angular distance from each other and making use of the blasts from thetwo blowing cylinders preferably in series or in seriesparallel.

,A further purpose of my invention is to provide a rotary blower with animpeller blade and side protecting flared webs or vanes all coiiperatingwith a single rotary valve to seal throughout the circumference of imller travel.v

A urther purpose of my invention is to provide a rotary blower havingtandem cylinders of the samesize or of different sizes, varying eitherin length or diameter, A or both, 1n series arrangement, using valvemechanisms for the two cylinders in axial coincidence, but cooperatingeach with a single impeller blade and at diiierent times.

Further purposes of my invention will appear in the specification and inthe claims appended thereto.

I have preferred to illustrate my invention by a single cylinder havingbalanced impeller and valve, and by two forms of tandem cylinders,balancing by the. impellers,- all of which have proved practical and ofgood mechanical proportion and. construction, without, however,intending to suggest that these are the only forms in which my in.-vention ma'ymppear, and, in fact, with knowledge that the structuralembodiment of my invention may be greatly varied.

, Figure 1 is a horizontal section of a single 'vided with end wallscylinder and balanced impeller and valve embodying my invention. Fig. 2is a trans verse section of Fig. 1 upon linco-m thereof. Fig. 3 is atransverse section of Fig. 1 upon line w-w thereof. Fig. 4: is ahorizontal section of one form of my invention corrcspending to Fig. 1.Fig. 5 is a vertical section of the structure shown in Fig. l upon linea2-w of Fig. 4, looking in the direction of the arrows. Fig. 6 isavertical section of the structure shown in Fig. 4, taken upon line c 0,and having its direction indicated by the arrows in that figure. Fig. 7is an end elevation of the structure shown in Figs. 4, 5 and 6 lookingfrom the leithand end of Fig. 4. Fig. 8 is a broken perspective view ofthe structure shown in Fig. 5. Fig. 9 is a broken perspective View ofmechanism at adjoining ends of the two cylinders seen in Fig. 4. Fig. 10is a horizontal section of a third form of my invention. Fig. 11 is atransverse section of the impeller blades taken upon linfa--z of Fig.10. Fig. 12 is a broken perspective view of the structure shown inFig.*1 1.

The same reference numerals indicate like parts in the drawings.

1 is an outer casing which is divided transversely into two parts whichare bolted together through holes 2 and which are pro- 3, l, which aresimilar but reversely facing. At opposite ends inlet and exhaustopenings 5 and 6 lead into compartments formed by Casingsl, 3 withinwhich bearings 9, 9 and ll), 10 support shafts 11, 11 and 12, 12,carrying the fimpellcr and crescent valve respectively. Upon one end ofeach of these shafts is placed a gear 13, so that the two gearsintcrmesh and. cause the shafts to rotate at equal speed asthe result ofmotion imparted to one of them through pulley 14,-.

The impeller 15 is made up of blade 16, side wings 17, 17 forming apassage between each 0 and the blade, a web 18 joining the wings 17,

17 and a' counterweight-19 within the web and of sufiicient size tocompensate for the blade and wings. 'lhcf'wings depart from.

the cylindrical form of the web '18 and are 10 conveniently described.as flared r The counterweight results in .a more or less completefilling of the space between the shaft and the web throughoutthe greaterpart of the length of the impeller, but leaves'the 110, ends free foradmission port 20- and exhaust port 21, upon opposite sides of theimpeller from to the space upon different sides of the blade,respectively, by which the air is freely;

admitted at the one end and discharged at the other. With rotation ineithei direction air will be admitted freely behind the blade and have acontinuously open exhaust ahead of the blade.

.In order that a trap or seal may be, formed at some point in thecircle-of revolution of the blade 16, and which shall at the same timepermit the blade to pass it without appreciable leakage, I provide acrescent valve 22 with whose inner surface 23 the blade affords a sealby approach as close as possible without actual contact. The edges 24,25of the crescent follow, for different directions of rotation, the outersurfaces 26, 27 of the wings, and the outer surface 28 of the crescentcorrespondingly seals with the outer surface 29 of the web, so thatthere is an effective sealing action between different parts of thecrescent and the iinpeller. As a result, with each rotation there is aninlet of a cylinder full of air at the same time that the cylinder fullof-air admitted during the preceding rotation, is'trapped and expelled.The action is the same, and-continuous, whichever the direction ofrotation. The crescent valve is balanced by weights 30, 80 and the endsof the valve and impeller are sealed against passage of air other thanthrough the ports by effective approach. to or contact with the openings31 and 32.

As best seen from Fig. 3, the space between the impeller blade and thewing-upon one side affords a passage within which the air from the inletport- (not there shown) may enter and from which it is free to enter thecylinder back of the blade as soon as the blade has cleared the crescentvalve. It is shut off from free entry into the cylinder from the timethe edge of wing 17 comes into operative relation. with edge 25 untilblade 16 leaves the inner surface of the crescent. Likewise the spacebetween the'blade and the other wing affords a passage within which theair which is being compressed ahead of the blade may pass to the outletaperture. In this case also tlieiipassage is shut off from the rest ofthe cylinder from the time the edge of its wing conles in operativerelation with the edge 24 of the valve until the blade 16 ceases tofollow the inner surface of thecrescent. During these two short periodsthe inlet and outlet passages respcctively are of use in equalizingpresof the crescent and impeller respectively in one cylinder bydiametrically-oppositely located corresponding members in thy: other thefirst group: I prefer to make use of, cylinders of diflerent sizes, inthis case of the same diameter but of different lengths, and to supplyall of the air for the shorter cylinder from the blast or forward sideof the impeller blade of the larger cylinder. Each of the two cylindersand contehts is identical in principle with that which Fhave describedin Figs. 13, but a single impeller and a single valve, each havingdiametrt cally opposite though similar parts, is used for the twocylinders, ordinarily without necessity for other counterbalancing, andthe intermediate structure to prevent leakage and allow proper airpassage is not shown in those figures.

I will briefly distinguish the slightly different structures by whichthe principles represented in Figs. 1-3 are applied'to the twocombinations of cylinders shown, talking up Figs. 44) first. The frame1' is necessarily extended to provide for the diaphragm 33 as well asends 3, 4, here shown as fitting to the shafts, a permissible form. Theparts 514 are substantially the same. The impeller 15 has blades 16, 16,wings 17, 1'7 and webs 18, 18 but no counterweight 19. The inlet port 20and outlet port 21 are shown in permissible slightly difi'e'rent forms.The crescent valve 22' has oppositely facing inner surfaces 23, 23 andouter surfaces 28, 28, and edges 2d, 24, 25, 25- following the contoursrespectively of wings 26, 26 and 27, 27 until the outer surfaces 28, 28begin to tell about 29, 29.

The spaces 34, 34 within the webs, pro-l dicated in Figs. l9 givedirections of movement of air and of rotation which are highly desirablein this form as well as consistent with each other, While the arrows inthe other forms indicate snerely' an arbitrary selection among equallydesirableydirections Q of movement. If the two cylinders be made ofequal size in the form shown ip Figs. 4 this form also becomes fullyreversible. The passage of air from one cylinder into the other in thisform is provided by a port 35' which leads from the compressed} air orblowing side of the cylinder within which. the air first enters, hereshown as cylinder 36, to the admission side of the blade in cylinder 37;that is from the space just ahead of the blade 16 to the space ,just behind the blade 16'. The air is admitted freely back of the blade 16 andis trapped at each revolution so as to be expelled in front of thisblade at the neat revolution and is forced into the smaller cylinder.37, at a correspondingly higher pressure, back of the the parts the sameas in as to the relative sizes of peller blade 16 and ahead of impellerblade front of blade 16. This air, so driven into cylinder 37 back ofits blade and at a pressure above the atmospheric pressure, is likewisetrapped at each rotation and driven out of this cylinder upon thesucceeding rotation of the blade 1(3. These several actions arecontinuous, with the resultthat air is constantly being admitted tocylinder 30, driven into cylinder 3T'and expelled from cylinder 37. Thisarrangement of the'two cylinders is in series since, from the ameviewpoint as to each, the outlet from the blowing part of the one isinto the intake of the receiving part of the other. I have notconsidered illustration of the storage space or supply duct necessary.

In the form shown in Figs. 10, 11 and 12, I prefer to supply air underatmospheric pressure to both cylinders,'that in the second cylinderpassing freely into it through the first, so that air enters freely backof both impeller bladesand at the same position relatively to theircomplete rotations. This constitutes one series path of air flow betweenthe two cylinders. I prefer to make Figs. 4-9, except the cylinders andthe difference in the arrangement of the ports between the twocylinders. I prefer to make the cylinders 38, 39 of the same length anddiameter, and to form a port 40 between them, which affords passage fromth space back of the impeller blade 16 in cyl'nder 38 into the cylinder39, directly back of the impeller blade 16. The direc-' tion of the aircurrent is pointed out in' Figs. 10, 11 and 12 by arrows -11. From thefront of the impeller blade 16 and as indicated by arrows 4:2, a port 43ermits passage of air axially through the ivision plate and thencircumferentially so as to allow this air to enter the cylinder 39directly in front of the impeller blade 16', constituting a secondseries path of air flow between the two cylinders, The volume of airacted upon by impeller blade 16 thusbecomes approximately double thatacted upon by impeller blade 16, including both the cylinder full of airat atmospheric pressure admitted through port 40 and'trapped between thevalve'and impeller blade once in each rotation of the latter, and alsothe cylinder full of air correspondingly trapped per rg gtation incylii'ider that' cylinder into cylinder 39 by the im- 16. It will thusbe seen that the spaces in and in the rear of the two impeller bladesrespectively in the two cylinders are connected in series so that theair reaching the rear of impeller blade 16" passes first through thespace in rear of the impeller blade 16 in cylinder 38, and that reachingthe space in front of the impeller blade 16 passes first through thespace in front of blade, and the crescent-shaped 38 and forced from.

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impeller blade 16 within cylinder 38 and is pumped by'said impellerblade 16. These two series paths of flow between the two cylinders mightfairly be considered to be in parallel notwithstanding their minglinginthe second cylinder and constitute what I have termed the seriesparallel form.

It will be evident that the tendency to unbalance my impeller structureand'valve in the structure shown in Fig. 4 by reason of the dilferencein the length of the im pellersand valve structures in the differentcylinders would be compensated .wholly, or in part, by the difference inretardation to the impellers in the two cylinders due to the differenceinpressures against which they are operating and that any requiredcompensation for the difference may be made up by the counterweights.

Having thus described my invent-ion, what I claim as new and desire tosecure by Letters Patent is:

1. In a device of the character'stated, a cylinder and an impellertherein in combination with a crescent-shaped valve; the impellerhavinga blade fitting the cylinder, curved wings on opposite sides ofthe: blade, an inlet port leading into the space between the blade andone wing, an outlet port leading from the space between the blade andthe other wing and a cylindrical surface concentric with the impelleraxis, joining the bases of the wings around the'back of the valve havinga concave surface traced by the path of the outer edge of the impellerblade, edges tracing the outer surfaces of the impeller wings and aconvex surface corresponding in diameter and circumferential extent tothe cylindrical part of the impeller.

2. In a device of the character stated, a pair of cylinders in series, apair of 0ppositely placed impeller blades in said cylinders, av pair offlared wings joined to sub stantially surround the impeller blade ineach cylinder, the spaces between the Wings in the two cylinders beingjoined by a port, and a valve in each cylinder rotating co incidentlywith its impeller blade and wings and cooperating therewith.

v 3. In a 'device of the character stated, adjoining cylinders, impellerblades in the two cylinders connected together, wings sub-v stal' tiallyinclosing the impeller blades, the

space within the wings in adjoining cylcylinder connected toblades andwings to form a complete seal.

4. In a device of the character stated, a air of cylinders in series, apair of impeller lades operating in said' cylinders, the two cylindersbeing joined by a port, flared win partially inclosing each impeller eand joined about the blades by cylinindei s being connected by a. port,and a single valve in each gether and cotiperating with the impellerdrical portions, acrescent shaped valve r0- tating synchronously withthe impeller blade in each cylinder to present its concave side to theblade and flared wings partially surrounding each impeller, and rollingwith the cylindrical joining portions. of said Wings.

5. In adevice of the character stated, a

' pair of cylinders in series, a pair of oppositely placed in'ipcllerblades operating 'coincidently therein, side wings in proximity to eachimpeller blade and substantially inclosing the space about the same, thespaces within the wings in the two cylinders being connected by a portand a, single valve in each cylinder rotating coincidently with theimpeller blades and approaching the impeller blades and their Wings toact as a seal to the impeller at each rotation.

THOMAS W. GREEN;

Witnesses:

MA HOFMANIL WILLIAM S'rEELL JACKSON.

